Thursday

December 8, 2016
Total # Posts: 2,557

**calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**Calc**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Calc**

Change from rectangular to cylindrical coordinates. (Let r ≥ 0 and 0 ≤ θ ≤ 2π.) (a) (3, −3, 2) (b) (−2, −2sqrt3, 5)

*October 25, 2016*

**Calc**

Write the equations in cylindrical coordinates. (a) 3z = 2x^2 + 2y^2 (b) 7x^2 + 7y^2 = 4y

*October 25, 2016*

**CALC**

Find the rectangular coordinates of the point, whose cylindrical coordinates are given. (a) (4, π/4, 1) (x, y, z) = (b) (6, −π/3, 5) (x, y, z) =

*October 25, 2016*

**Math**

Cheater! Do your own math. Cheating = Lazy. Work hard!

*October 20, 2016*

**Social Studies**

WRONG. Alexandria is wrong! Answers: 2. B 3. D I don't know the first answer though.

*October 20, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**Math**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**Math**

Find center of mass of the lamina that occupies the region D and has the given density function ρ. D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y) mass=30 Find center of mass

*October 19, 2016*

**math**

what is the solution to the following system? -2x-y=1 -4x-2y=-1

*October 19, 2016*

**CALC **

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**CALC **

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 19, 2016*

**SOCIAL STUDIES (CHECK answer)**

MS sue how does saying i agree help anyone

*October 19, 2016*

**Calc **

Find the mass and center of mass of the solid E with the given density function ρ. E is bounded by the parabolic cylinder z = 1 − y^2 and the planes x + 6z = 6, x = 0, and z = 0; ρ(x, y, z) = 4. m=? x, y, z=?

*October 19, 2016*

**Calc **

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 19, 2016*

**math**

why do you need to tell everybody their location??? that makes no sense at all

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The solid enclosed by the cylinder x^2 + y^2 = 9 and the planes y + z = 19 and z = 2.

*October 18, 2016*

**Calc**

Use a triple integral to find the volume of the given solid. The tetrahedron enclosed by the coordinate planes and the plane 8x + y + z = 4

*October 18, 2016*

**Calc**

Evaluate the triple integral. SSS(triple integral T 3x^2 dV where T is the solid tetrahedron with vertices (0, 0, 0), (1, 0, 0), (0, 1, 0), and (0, 0, 1)

*October 18, 2016*

**Calc**

Evaluate the following integral using three different orders of integration. *triple integral E (xz − y3) dV, where E = (x, y, z) | −1 ≤ x ≤ 3, 0 ≤ y ≤ 4, 0 ≤ z ≤ 3

*October 18, 2016*

**Calc **

Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ. D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y) m=? (x,y)=?

*October 18, 2016*

**CALC**

Its wrong.

*October 18, 2016*

**Thermochemistry**

The given reaction was: 2C6H6(l)+15O2(g)=12CO2(g)+6H2O(g) dH rxn= -6278kJ

*October 17, 2016*

**Thermochemistry**

What volume of benzene (C6H6, d= 0.88g/ml, molar mass= 78.11g/mol) is required to produce 1.5x10^3 kJ of heat according to the following reaction? I just can't figure out what equation to use to solve this. Help, please?

*October 17, 2016*

**Physics Force and Friction question**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

*October 16, 2016*

**Physics **

You are in an elevator that is accelerating upwards at 2m/s^2. If your mass is 70kg, what is the normal force pushing on you by the floor of the elevator? A. 70N B. 690N C. 830N Please give the correct answer and an explanation as to why its correct.

*October 14, 2016*

**Physics**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

*October 14, 2016*

**Physics**

Multiple Choice. If all of the forces acting on an object an object are balanced (net force is zero), then: a. The object's speed will decrease b. The object's direction of motion can change, but its speed cannot C. The object is ecperiencing zero acceleration Please ...

*October 14, 2016*

**Physics**

Why is the joule-second (J*s) equivalent to kg*m^2/s ?

*October 14, 2016*

**physics**

A stone is thrown vertically upward at 23 m/s. How fast is it moving when it reaches 14 m?

*October 13, 2016*

**Social Studies**

Okay thank you so much!

*October 13, 2016*

**Social Studies**

Why did the Western Roman Empire fall? Thank you for helping me!

*October 13, 2016*

**Social Studies**

Okay thank you so much I really really appreciate it!

*October 13, 2016*

**Social Studies**

How might Greece's psychical features have affected the development of Greek trade, culture, and legacy? Thank you for the help

*October 13, 2016*

**Social Studies**

Okay, thank you so much, have a nice day/night!

*October 13, 2016*

**Social Studies**

______Introduced Europeans to Muslim inventions, such as the astrolabe that helped sailors navigate the seas. A) The Crusades(I pick this) B) The Reconquista C) The Vikings D) The Magna Carta Thank you for helping me!

*October 13, 2016*

**physics grade 11**

how do i figure out how fast a car is going when all i know is frequency?

*October 13, 2016*

**Math. please help**

-1/2 + 1/3 = Adding and subtracting fractions with rational numbers.

*October 12, 2016*

**Calc**

Evaluate the integral by reversing the order of integration. (2 integrals) 0 to 8 cube root(y) to 2 8e^(x^4) dx dy

*October 11, 2016*

**Calc **

Evaluate the integral by reversing the order of integration. (2 integrations) 0 to 1 sqrt(x) to 1 8(y^3+1) dy dx

*October 11, 2016*

**Calc **

Evaluate the integral by reversing the order of integration.(2 integrals) 0 to 4 5ex2 dx dy 3y to 12

*October 11, 2016*

**Calculus**

Find the volume of the solid under the plane 3x + 3y − z = 0 and above the region bounded by y = x and y = x^4

*October 11, 2016*

**Calculus**

Find the volume of the given solid. Under the surface z = 7xy and above the triangle with vertices (1, 1), (4, 1), and (1, 2)

*October 11, 2016*

**HELP ME PLEASE I NEED HELP history**

Why did Congress decide the election of 1800? Select two a. based on the outcome, it was mandated by the us consitutuion *** b. the popular vote was a tie c. no candidate won the electoral vote d: not enough citizens voted to determine the outcome ***

*October 10, 2016*

**SOCIAL STUDIES (CHECK ANSWERS PLEASE)**

do you know if #6 is right have you submitted it yet

*October 7, 2016*

**SOCIAL STUDIES (CHECK ANSWERS PLEASE)**

im stuck on this also do you know any of the answers pls answer

*October 7, 2016*

**Physics (PLEASE HELP PRONTO)**

A cart with a mass of 5.35 kg is placed on a frictionless ramp at an angle of 14.2. The cart is released and rolls down the ramp. Find the acceleration.

*October 7, 2016*

**C++**

It won't compile because it's saying the second "else if" isn't valid. I have tried changing things around and the best I can get is when I enter a value starting with"A" it returns nothing and a value starting with "B" returns and ...

*October 6, 2016*

**C++**

I am trying to create a program that displays shipping charges for two region codes. The region code has to have exactly 3 characters (the letter A or B followed by two numbers). Display a message if invalid region code is entered. use a sentinel value to exit program. ...

*October 6, 2016*

**science**

we need to see the answers

*October 6, 2016*

**art**

Please link the art or I cannot help you.

*October 5, 2016*

**Social Studies**

Were these answers right????

*October 3, 2016*

**Health**

Lyssey likes to bully others here and she is wrong. Your answers aren't all wrong.

*October 3, 2016*

**Math**

thank you so much!

*October 3, 2016*

**Math**

oh wait!! is it 9?!

*October 3, 2016*

**Math**

[(8^2 - 4) - 6] / 6 = ?? i think it's 59?? idk what the brackets mean. can someone PLEASE explain this to me???

*October 3, 2016*

**Physics**

A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. If the hill is 200m long, how long does it take for the sled to reach the bottom?

*October 2, 2016*

**Physics**

A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. Write the equations of motion in the two directions where the x axis is along the hillside.

*October 2, 2016*

**English**

yea i need help on this too someone help

*September 30, 2016*

**American Government**

can confirm, it is C

*September 29, 2016*

**Social Studies**

what was the flaw in the act passed by congress that established a tax on whiskey? a. it rewarded farmers who grew corn b. it did not spread the tax burden evenly** c. it was similar to taxes britan had proposed d. it had to be collected in person by tax collectors

*September 29, 2016*

**world history**

omg 100%

*September 28, 2016*

**Math please help!!!**

Julia is allowed to watch no more than 5 hours of television a week. So far this week, she has watched 1.5 hours. Write and solve an inequality to show how many hours of television Julia can still watch this week.

*September 26, 2016*

**american Government**

I swear Ms.Sue is Ms. Scott.. lol

*September 25, 2016*

**american government**

Well said ^ And No name is right.

*September 24, 2016*

**check my work**

100% correct :)

*September 22, 2016*

**check my work**

1. B 2. A 3. C 3/3 100%

*September 22, 2016*

**math**

x^3-(p+q-r)x^2+(pq-pr-qr)x+pqr How to factor this??

*September 22, 2016*

**physics**

Answer to my own question, you use d=vi*t+1/2*a*t^2 after solving for t you use d=vxo*t

*September 21, 2016*

**physics**

A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.868 m (2.85 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?

*September 21, 2016*

**american goverment check answers**

Anonymous is 100% right

*September 20, 2016*

**american goverment check answers**

100% correct. ^ Thanks.

*September 20, 2016*

**Math**

I came up with a different example, Jack wants to buy 4 pumpkins, but he needs to know how much the pumpkins cost so he doesn't spend more than $25. 4p ≤ 25 4p/2 ≤ 25/4 p=6.25 p ≤ $6.25 is this right?

*September 20, 2016*

**Math**

Give a real-world scenario in which you would write an inequality rather than an equation. I was thinking, Jack has to bring at least $25 to a carnival. So the inequality would be x ≥ 25? or could you help me with a different example?

*September 20, 2016*

**American Government**

tj is correct

*September 19, 2016*

**Math 2**

Whats the question?

*September 19, 2016*

**Algebra 2**

Thank you!!!

*September 19, 2016*

**Algebra 2**

How did you get x^3/5?

*September 19, 2016*

**Algebra 2**

Thank you so much. I understand it now!!

*September 19, 2016*

**Algebra 2**

1. Convert the 5th root of x^3 into a rational expression. 2. Solve i^63 I don't know how to solve these so please help me!!!

*September 19, 2016*

**Science**

What is the question asking?

*September 19, 2016*

**Biology**

What are your answers?

*September 19, 2016*

**Maths**

BECAUSE NO ONE IS ANSWERING MY QUESTION. Im so sorry. I really need your help guys.

*September 13, 2016*

**Maths**

Plastic drinking straws are manufactured to fit into drinks cartons which have a hole in the top. A straw fits into the hole if the diameter of the straw is less than 3 mm. The diameters of the straws have a normal distribution with mean 2.6 mm and standard deviation 0.25 mm...

*September 13, 2016*

**Math**

I just wanna try. If me, I do it like this, 35/(35+72) X 100% = 32.7%

*September 13, 2016*

**Calculus**

Find the velocity and position vectors of a particle that has the given acceleration and the given initial velocity and position. a(t) = 2 i + 6t j + 12t2 k, v(0) = i, r(0) = 2 j − 7 k

*September 12, 2016*

**Calculus**

Find the tangential and normal components of the acceleration vector. r(t) = t i + t2 j + 4t k aT= aN=

*September 12, 2016*

**Government**

OCA was correct, but 4 is actually B, Separation of powers, got 9/10 thanks!

*September 12, 2016*

**Calculus**

The curves r1(t) = 5t, t^2, t^4 & r2(t) =sin t, sin 4t, 3t intersect at the origin. Find their angle of intersection, θ, correct to the nearest degree.

*September 12, 2016*

**Calculus**

Find parametric equations for the tangent line to the curve with the given parametric equations at the specified point. x = 5 ln t, y = 8sqrt(t), z = t^5 (0,8,1) (x(t),y(t),z(t))=( )

*September 12, 2016*

**Maths**

A curve is such that dy/dx = 2- 8(3x+4)^-1/2 - A point P moves along the curve in such a way that the x-coordinates is increasing at a constant rate of 0.3 units per second. Find the rate of change of the y-coordinates as P crosses at the y-axis.

*September 10, 2016*

**Calculus**

a) Find parametric equations for the line through (4, 1, 4) that is perpendicular to the plane x − y + 2z = 7. (Use the parameter t.) b) In what points does this line intersect the coordinate planes? xy-plane? yz-plane? xz-plane?

*September 5, 2016*

**Calculus**

Consider the following planes. 5x − 4y + z = 1, 4x + y − 5z = 5 a) Find parametric equations for the line of intersection of the planes. b) Find the angle between the planes

*September 5, 2016*

**Calculus**

Find (a cross b)dot product a? & Find the cross product(a × b) dot product b? a = 1, 1, −1 b = 4, 8, 10

*September 5, 2016*

**Calculus**

I can not seem to get this right Find an equation of a sphere if one of its diameters has endpoints (5, 5, 5) and (7, 7, 7).

*September 5, 2016*

**Calculus**

Just needed a refresher. Thanks.

*September 4, 2016*

**Calculus**

Write the equation of the sphere in standard form. x2 + y2 + z2 + 4x − 2y − 2z = 19

*September 4, 2016*

**Calculus**

Find, correct to the nearest degree, the three angles of the triangle with the given vertices. A(0, 1, 3), B(-2, 4, 5), C(1, 4, -3), ∠CAB = ° ∠ABC = ° ∠BCA = °

*September 4, 2016*

**Chemistry**

How many electrons in CH3NH3+ ?

*September 1, 2016*